:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --fg: #1a1a1a;
  --card-bg: #ffffff;
  --border: #dcdfe4;
  --accent: #2563eb;
  --warn-bg: #fff4e5;
  --warn-fg: #8a5300;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e7e9ec;
    --card-bg: #1e2126;
    --border: #2f333a;
    --accent: #6ea8fe;
    --warn-bg: #3a2c12;
    --warn-fg: #f0c27b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
}

h1 { margin: 0 0 8px; font-size: 1.4rem; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }

.banner {
  background: var(--warn-bg);
  color: var(--warn-fg);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin: 0;
}

main {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th { color: var(--accent); font-weight: 600; }

.empty { opacity: 0.6; font-size: 0.9rem; }

.entity-group { margin-bottom: 16px; }
.entity-group h3 { margin: 0 0 8px; font-size: 1rem; }

.total-line { font-size: 1.3rem; font-weight: 700; margin: 0 0 16px; }
.total-sub { font-size: 0.85rem; font-weight: 400; opacity: 0.7; display: block; margin-top: 4px; }

nav { margin: 4px 0 10px; font-size: 0.9rem; }
nav a { color: var(--accent); }
.user-info { opacity: 0.7; margin-left: 10px; }
.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: underline;
}

.login-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.login-card {
  width: 100%;
  max-width: 360px;
}

form label {
  display: block;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

form input, form select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-size: 1rem;
}

form button[type="submit"] {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 18px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 4px;
}

.error { color: #d33; font-size: 0.9rem; }

.expense-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  align-items: end;
}

.expense-form .wide { grid-column: 1 / -1; }
.expense-form button { grid-column: 1 / -1; justify-self: start; }

.status-threshold { margin-bottom: 10px; }
.status-threshold-label { font-size: 0.9rem; margin-bottom: 4px; }
.progress-bar {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  height: 10px;
  overflow: hidden;
}
.progress-fill { background: var(--accent); height: 100%; }

.export-buttons { display: flex; gap: 10px; grid-column: 1 / -1; }
.export-buttons button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
}